government of india ministry of railways - rdso - Indian Railway

GOVERNMENT OF INDIA 

MINISTRY OF RAILWAYS 

DRAFT SPECIFICATION 

FOR 

Level Crossing Gate Control & Monitoring System 

Specification No. RDSO/SPN/TC/49/2010 Version 4.0 

TELECOM DIRECTORATE 

RESEARCH DESIGNS & STANDARDS ORGANISATION 

LUCKNOW‐226011 

1 of 40

1.0 INTRODUCTION: 

This specification covers the General Requirements, Functional Requirements, System 

Requirements, Technical Requirements for “Level Crossing Gate Control & Monitoring 

System” for use over Indian Railway and is issued under specification No. 

RDSO/SPN/TC/49/2010. Further requirements of Test & Inspection are also covered in this 

specification. 

1.1 This specification covers the technical provision only and does not include the provision of a 

contract. In the absence of IRS specification, the procurement may be made as per draft 

specification. 

1.2 This specification requires references to the following standards specifications: 

SN Specification No. Description 

1. IS-9000 (Series) Basic Environment Testing Procedure for Electronic and 

Electrical items. 

2. IS-9001 (Series) Guidance for Environmental Testing 

Wherever reference to any of the above specification appears in this document, it shall be 

taken as a reference to the latest version of the specification unless the year of issue of the 

specification is specifically stated. 

2.0 GENERAL REQUIREMENTS 

2.1 The objective of this System is to provide reliable recorded Data & Voice Communication 

System between Station and Level Crossing Gates for exchange of Private Number amongst 

Station Master and Gatemen for Closing/Opening of Gates. 

2.2 The System shall be designed in such a way that Station Master shall be able to control at 

least 4 Gates on either side of the Station from his Station Equipment. This System comprise 

of Station Equipment and LC Gate Equipment. A General System Schematic is given in 

Figure-1. An overall Network Diagram of the System is given in Figure-2. 

2.3 Manned Level Crossing Gates (LC Gates) over Indian Railways are classified in following 

five categories. 

a) Engineering LC Gate, Interlocked, Normally Open to Road Traffic 

b) Engineering LC Gate, Non-Interlocked, Normally Open to Road Traffic 

c) Engineering LC Gate, Non-Interlocked, Normally Closed to Road Traffic 

d) Traffic LC Gate, Interlocked, Normally Open to Road Traffic 

e) Traffic LC Gate, Non-Interlocked, Normally Close to Road Traffic 


Figure-1 : System Schematic Diagram 


Figure-2 : System Network Diagram 


2.4 LC Gate Equipment shall be configurable to any Category of LC Gates as defined in Clause 

2.3. Station Equipment shall be configurable to accommodate any combination of Category 

of LC Gates on either side of Station as defined in Clause 2.3. 

2.5 Station Equipment and LC Gate Equipment shall be suitable for working in Single Line, 

Double Line and Multiple Lines.. 

2.6 The System shall follow the method of exchanging Private Number between Station Master 

and Gateman as stipulated in Annexure-II. The mode of Working is called ‘MANUAL 

MODE’ 

2.7 Other Mode of Working is called ‘AUTO Mode’ in which Private Number will be 

automatically generated. This method (Automatic Generation of Private Number instead of 

using Private Number Booklet) of exchanging Private Number between Station Master and 

Gateman will be as stipulated in Annexure-III. 

2.8 Station Equipment and Gate Equipment shall be configurable to work in MANUAL Mode’ 

or AUTO Mode’. During commissioning of System, it must be ensured that Station 

Equipment and all LC Gate Equipments for a Station are configured in same Mode of 

Working. Presently ‘MANUAL Mode of working is followed on various Zonal Railways, 

and therefore ‘AUTO Mode’ shall be selected by user only after due consideration. 

2.9 All the events like Gate Closing, Gate Opening and Messaging etc. must be stored in the 

Data Logger of Station Equipment and LC Gate Equipment with Date, Time, Train No. Gate 

Number, Exchanged Private Number of Station Master and Gateman. It should be possible to 

retrieve this Data by connecting Laptop to a Port provided on the equipment. Further it 

should be possible to check previously stored data on One-Line Displays of the equipments 

using SCROLL UP & SCROLL DOWN Keys. 

2.10 When Station Master or Gateman wishes to have voice communication, the same shall be 

possible by using Telephone Instrument provided with the equipments. 

2.11 During Failure of ‘Station Equipment’ and/or ‘LC Gate Equipment ‘, it shall be possible for 

Station Master and/or Gateman to Switch-over to ‘Telephone Mode’ by manually operating 

‘standby/Main Switch’. In this mode Electronic Circuitry of equipments will be completely 

by passed and Telephone Instruments will be directly connected to 2-Wire Omnibus Line to 

facilitate Voice Communication. 

3.0 FUNCTIONAL REQUIREMENTS 

3.1 Panel Layout of ‘Station Equipment’ and ‘LC Gate Equipment’ are also attached as 

Appendix-I. 

3.2 ‘Station Equipment’ and ‘LC Gate Equipment’ shall be provided with mechanical Key- 

Locking arrangement to prevent unauthorized operation of the system. ‘Station Equipment’ 

and L.C Gate Equipment ‘ shall operate only when Keyed in. When Key is taken out, these 

equipments shall hold in their last operated position. However during Key-Out position, 

System Power shall remain in ON condition and these equipments shall continue to receive 


messages and also continue to play Audio Messages. In ‘Telephone Mode’ even if Key is 

taken out, Telephone will continue to work. 

3.3 ‘Station Equipment’ and ‘LC Gate Equipment’ shall work in MANUAL Mode in which case 

Private Number shall required to be fed by Station Master and Gateman in ‘Station 

Equipment’ and ‘LC Gate Equipment’. Working of different category of LC Gate using this 

System in MANUAL Mode is explained in Appendix-II attached. Bold sentences indicate 

action to be taken ‘Station Master or Gateman’. 

3.4 ‘Station Equipment’ and ‘LC Gate Equipment’ shall work in AUTO Mode in which case 

Private Number shall be automatically generated by ‘Station Equipment’ and ‘LC Gate 

Equipment’ and displayed on Displays provided on the equipments. Working of different 

category of LC Gate using this System in AUTO Mode is explained in the Appendix-III 

attached. Bold sentences indicates action to be taken Station Master or Gateman. 

3.5 The Message sent by Station Master from Station Equipment for a particular LC Gate shall 

go to that LC Gate Equipment only. Similarly the Message from LC Gate Equipment shall go 

to concerned Station Equipment only. As such Station Equipment are provided with ‘Station 

Id’ and LC Gate Equipments are provided with ‘Gate Id’. These ‘Station Id’ and ‘Gate Id’ 

are only for internal working of equipments and Station Master & Gateman are not required 

to be concerned for these Ids. 

3.6 The Audio Message shall be in Hindi, English or any Regional Language. Selection of any 

two languages depending upon the requirement of the Zonal Railway shall be possible. 

3.7 As the display at LC Gate Equipment will show only numbers and symbols, the display will 

be in English Only. Display of Station Equipment will also be in English only. 

3.8 Configuration of ‘Station Equipment’ and ‘LC Gate Equipment’ shall be carried preferably 

using Dip Switches/Jumper Setting. Configurable features include ‘Station Id’. ‘Gate Id’, 

‘Gate Category’, Operation Mode’, ‘Key Type’, ‘Language’ etc. 

3.9 Programming of ‘Station Equipment’ and ‘LC Gate Equipment’ should be protected suitably 

using User Id and Password. Without correct User Id and Password it shall not be possible to 

change the setting of parameters of the equipment like ‘Gate Number’, ‘Station Name’, Date, 

Time etc. 

3.10 Data recording in ‘Station Equipment’ and ‘LC Gate Equipment’ will record all the events 

related to operation automatically duly Date & Time Stamped. These Recorded events shall 

be retrieved using Laptop. 

3.11 During Failure of ‘Station Equipment’ and/or ‘LC Gate Equipment’ and/or ‘LC Gate 

Equipment’ it shall be possible for Station Master and Gateman to Switch-Over to 

‘Telephone Mode’ by manually operating ‘Standby/Main Switch’. In this mode Electronic 

Circuitry of equipments will be completely bypassed and Telephone Instruments will be 


directly connected to 2-Wire Omnibus Line. During this ‘Telephone Mode’, following 

facilities using Inbuilt Electronic Circuitry of Telephone Instruments shall be available: 

3.11.1 In Telephone Mode, Telephones shall work in Master-Slave configuration. Station Telephone will work as 

‘Master ‘ and LC Gate Telephones will work as ‘Slave’. 

3.11.2 Station Telephone will have the facility to call any of the LC Gate individually by pressing corresponding ‘Gate 

Switch’ designated for a particular gate or to call all LC Gates collectively by ‘ALL Call Switch Button’. When 

Master presses “ALL CALL Switch/Button, all the Gate Telephones are activated and can converse to the 

Master as well as among themselves. 

3.11.3 In addition to these switch Station Telephone shall have another ‘Disconnect Switch/Button’ for disconnecting 

All Gate Telephones. All the Gate Telephones will be disconnected and Indicating LED on Station Telephone 

meant for all the Gate Telephones will go OFF, when Disconnect switch of Master Telephone is pressed. 

3.11.4 Gate Telephone will have the facility to send an indication to Station Telephone that it wants to talk to the 

Station Master. The Gate Telephone will have only one switch/button by pressing which it will draw the 

attention of the Station Master. 

3.11.5 Unless permitted and activated by the Station Master, “Gate to Station” or “Gate to Gate” or “Station to Gate” 

conversation shall not be possible. Only when Station Master presses ‘Gate Switch’ designated for a particular 

gate, that Gate Telephone will be activated for conversation. 

3.11.6 When SM is having communication with any Gateman, then another Gateman shall not be able to listen the 

ongoing conversation. 

3.11.7 Only when Station Master presses two or more Gate Switches/Button, those Gates are activated and will be able 

to converse to the Master as well as between them. The activated Gate Telephone will remain activated for 

conversation even if the handset of the master telephone is placed on the hook so that conversation between the 

Gate Telephones can continue. 

3.12 Voice Recording at ‘Station Equipment’ shall be provided, which will record all the Voice 

Communication taking place between Station Master and Gateman. These Voice Recordings 

can be retrieved by transferring it to a Laptop. If Voice Recording is not taking place, it 

should be reported by ‘Alarm’. 

3.13 In case Gateman is unable to execute the order of Station Master for closing the gate, he will 

immediately talk to Station Master over Telephone. As such Gate man should be able to 

promptly communicate with Station Master with the help of Telephone Instrument provided 

with the equipment. As such even without switching over to Telephone Mode, Telephonic 

Feature as given in Clause 3.12 shall be available albeit using Electronic Circuitry of Station 

Equipment and/or LC Gate Equipment. During this Voice Conversation, events like Ringing, 

Handset Lifting, Call Through, Called Disconnect etc. will be recorded. 

3.14 Voice Communication shall be Duplex when system is working on Physical Line. Similarly 

Voice Communication shall be Semi-Duplex/Simplex when system is working through 

Wireless on VHF Radio Sets. 


3.15 System display shall indicate train details, where train number is of alphanumeric like Goods 

Train & Service Vehicles etc. 

4.0 SYSTEM REQUIREMENTS 

4.1 The System shall be capable of working on both Wired (Overhead Line or Underground 

Cable) or Wireless(25 Watt VHF Radio Set). When System is working on physical line, the 

radio set shall be in Hot Standby Mode, so that in case of any failure of physical line, the 

system should automatically switch over to Wireless. 

4.2 Normally voice as well as data communication between Station Equipment and LC Gate 

Equipment will be through 2-Wire Physical Media. In case of Physical Line failure, alternate 

Wireless Medium shall work. There shall be dynamic switching to select first available 

working medium. 

4.3 Physical Line or Radio indication shall appear on Station Control Equipment as well as LC 

Gate Control Equipment so the advise to the maintenance staff shall be made without delay 

in case of Physical Line failure. 

4.4 Station Equipment as well as LC Gate Equipment must have provision to operate from any of 

the two available source of Power Supply i.e. Electric Mains and Battery. However, Solar 

Panel must be another source to charge the battery at LC Gate and this shall be part of the LC 

Gate equipment. 

4.5 Data Logging: 

4.5.1 Station Equipment as well as LC Gate Equipment shall have Data Logger to record all the 

events automatically with Date, Time, Train Number, Direction, Gate Number and 

Exchanged Private Number between Station Master and Gateman, which can be retrieved by 

connecting a Laptop. The provision of simultaneous data logging shall be made in both 

Station Equipment and LC Gate Equipment. 

4.5.2 Station Equipment and LC Gate Equipment shall have facility to record all the events related 

to their operation including event of Voice Communication. 

4.5.3 Station Equipment as well as LC Gate Equipment shall have facility to store minimum one 

lakh events. 

4.5.4 The data shall be stored in the FLASH memory so that the stored events can not be erased in 

case of power failure or fluctuations. 

4.5.5 When the Flash memory will be full with the logged data , then ‘FIRST IN ‘ information will 

be ‘FIRST OUT’ from the memory i.e. The system will follow FIFO architecture. 

4.5.6 Format of retrieved data shall be as follows: 

SN DATE TIME MODE FROM GATE PVT 

No. 

ACTIVITY 

1 17/10/.2010 13:02:03 LINE STN 102A 23 CLOSE ORDER- TRAIN 


NO:1234A, EXP, TIME:05:06, UP 

2 17/10/.2010 13:02:07 LINE GATE 102A 45 EXCH-PVT. NO. 

3 17/10/.2010 14:04:03 RADIO GATE 102A 67 CLOSE CONFIRMATION 

4 17/10/.2010 14:05:01 RADIO STATION 102A 89 EXCH-PVT. NO. 

5 17/10/.2010 15:06:13 LINE GATE 102A 12 OPEN REQUEST 

6 17/10/.2010 15:07:15 LINE STATION 102A 34 OPEN PERMISSION 

7 17/10/.2010 16:08:22 RADIO GATE 102A - - VOICE CALL 

8 17/10/.2010 17:08:30 LINE STN 102A -- VOICE CALL 

9 17/10/.2010 18:09:40 RADIO STN -- -- -- -- VOICE CALL ALL 

10 17/10/.2010 19:10:50 LINE STN -- -- -- -- VOICE CALL ALL 

11 17/10/.2010 17:08:30 TELE STN 102A -- -- VOICE CALL 

12 17/10/.2010 17:08:30 TELE GATE 102A -- -- VOICE CALL 

When retrieving data for viewing through Display using SCROLL UP & SCROLL DOWN 

Keys, one line at a time will be retrieved and displayed . While retrieving data through 

Laptop, it shall be possible to search and select the data to be retrieved. 

4.6 Voice Logging: 

4.6.1 The System should be designed in such a way that it should have built-in arrangement to 

process, record and store any ongoing Voice Communication from Station Equipment to LC 

Gate l Equipment and Vice Versa. 

4.6.2 The recording and storage of Voice Communication should start as soon as call is established 

between Station Equipment to LC Gate Equipment and the same should be terminated with 

the replacement of handset of the Telephone Instrument provided with Station Control 

Equipment to LC Gate Control Equipment. The recorded voice data shall be stored with date 

and time stamping 

4.6.3 The storage of Voice Communication should be arranged in FIFO architecture and in no way 

it should get corrupted once it is stored 

4.6.4 There shall not be any compression of the input voice signal and the originality of the 

recorded voice communication shall be ensured. The storage device recording capacity shall 

be 72 Hrs minimum 

4.6.5 Retrieval of Voice Communication: There shall be an Ethernet interface port through 

which stored voice communication can be transferred from Station Control Equipment to any 


PC/Laptop for listening and taking backup on CD/DVD media. Facility shall also be 

available using PC/Laptop for selection of any voice/ data for playing by entering desired 

date and time for specified duration. 

4.6.6 In case of any problem in voice recording, there shall be visual alarm to draw the attention of 

the ASM on duty, the same shall keep on glowing till such time acknowledged by the ASM. 

4.6.7 The distortion of the recorded voice input signal when reproduced through speaker shall not 

be more than 5% w. r. t. original input signal 

4.7 Station Equipment shall be equipped with GPS Clock. LC Gate Equipment shall have inbuilt 

RTC Clock, which shall synchronize itself with Station Equipment GPS Clock once every 

24 Hour. 

4.8 The LCDs used for System Information with Station Equipment as well as LC Gate 

Equipment must meet the following minimum specifications. 

Display Content 16 Char x 2 Row 

Character Dots 5x8 or 5x7 

Character size 9-10 mm x 4-5 mm 

LCD Display Type STN or FSTN 

LCD Category Transmissive or Transflective 

Minimum Viewing Angle Horizontal -60º, Vertical - 90º 

4.9 The LCD used for Train Information with Station Equipment as well as LC Gate Equipment 

must meet the following minimum specifications: 

Display Content 20 Char x 4 Row 

Character Dots 5x8 or 5x7 

Character size 9-10 mm x 4-5 mm 

LCD Display Type STN or FSTN 

LCD Category Transmissive or Transflective 

Minimum Viewing Angle Horizontal -60º, Vertical - 90º 

4.10 Seven-Segment Displays used for Private Number display with Station Equipment as well as 

LC Gate Equipment shall be of Industry Standard and Height of 9-10 mm . 

4.11 LEDs used for Station Equipment and LC Gate Equipment shall be SMD type with minimum 

size of 3.6 mm x 3.2 mm. 


4.12 Keys used for Station Equipment and LC Gate Equipment shall be preferably of embossed 

Membrance Type of minimum 1 CM x 1 Cm size or Momentary Pushbutton Type with 

protection from dust ingress. 

4.13 Physical Communication Line Protection: Surge/Transient Protection shall be supplied 

and provided between Station/LC Gate Equipment and 2-Wire Physical Communication Line 

in Series. The Surge Protective Device (SPD) should be as per the IEC 61643-21 or in 

compliance with UL Specification. Surge Protective Device shall be supplied alongwith 

Mounting, Termination & Housing Arrangement. Surge Protective Device shall meet 

following requirements: 

• Pluggable Device along with Base 

• Maximum Continuous DC voltage: 170 V 

• Total Nominal Discharge Current (8/20 µs pulse): 10KA 

• Impulse Limiting Voltage/Let Through Voltage: Line – Ground for 1 KV/ µs pulse: 

1000KA 

• DC Spark Over Voltage of voltage limiting component: 230 V (-20% to +30%) 

• Operating Temperature range: - 10º C to +60ºC 

• Relative Humidity: 5% to 95% 

• Degree of Ingress Protection: IP 20. 

• Bandwidth: 2.3 MHz minimum 

• No. of wires : 2 Wire/4 Wire 

• The Voltage Limiting Device shall fail in Short Circuit Mode. 

• Nominal Load Current: Not less than 120 mA. 

4.14 Power Line Protection (at the 230V AC Input of SMPS Power Supply of Station /LC 

Gate Equipment): 

(a) The Stage 1 protection shall consist of coordinated Class I/ B & II/ C type SPDs at 

the entry point of Input 230V AC supply in TT configuration in a separate wall mountable 

box. The Class I/B SPD shall be provided between Line to Neutral & Neutral to Earth. They 

shall be a voltage switching device and tested as per IEC 61643 with the following 

characteristics and features- 

SN Parameters Limits 

Between Line & 

Neutral 

Between Neutral 

& Earth 

1 Nominal Voltage (U0) 230V 230V 

2 Maximum continuous operating voltage (Uc) ≥ 255V ≥ 255V 

3 Lightning Impulse current 10/350μs (Imp) ≥ 25KA ≥ 50KA 


4 Response time (Tr) ≤ 100 ñs ≤ 100 ñs 

5 Voltage protection level (Up) ≤ 2.5KV ≤ 2.5KV 

6 Short circuit withstand and follow up 

current extinguishing capacity without back 

up fuse (Isc & Ifi) 

≥3KA ≥100A 

7 Temporary Over Voltage (UT) 400V min. for 05 1200V min. for 

secs. 

200ms 

8 Operating temperature / RH - 10 o C to +60 o C/ - 10 

95% 

o C to +60 o C/ 

95% 

9 Mounted on din rail din rail 

10 Indication Mandatory Optional 

11 Pluggability Optional Optional 

12 Potential free contact for remote monitoring Optional Optional 

13 Encapsulation Encapsulated Encapsulated 

14 Degree of protection IP20 IP20 

15 Housing Fire retardant as 

per UL 94 

Fire retardant as per 

UL 94 

(b) The Class I/ B SPD will be followed by Class II/ C SPD adjacent to it and connected 

between Line & Neutral. The device shall be a single compact varistor of proper rating and in 

no case a number of varistors shall be provided in parallel. It shall be voltage clamping 

device, thermal disconnecting type and shall be tested as per IEC 61643 with the following 

characteristics and features- 

SN Parameters Limits (between Line & 

neutral) 

1 Nominal Voltage (U0) 230V 

2 Maximum continuous operating voltage (Uc) ≥ 300V 

3 Nominal discharge current 8/20μs (In) ≥ 10KA 

4 Maximum discharge current 8/20μs (Imax) ≥ 40KA 

5 Response time (Tr) ≤ 25 ñs 

6 Voltage protection level (Up) ≤ 1.5 KV 

7 Operating temperature / RH - 10 o C to +60 o C/ 95% 

8 Mounted on Din rail 

10 Indication Mandatory 


11 Pluggability Mandatory 

12 Potential free contact for remote monitoring Mandatory 

13 Degree of protection IP20 

14 Housing Fire retardant as per UL 94 

(c) Class I/B and class II/C SPDs of Stage I shall be so coordinated that the voltage 

protection level of the coordinated devices is ≤ 1.5 KV. As such, these devices shall be from 

the same manufacturer and necessary test certificate in this regard shall be submitted by the 

manufacturer/ supplier. 

4.15 Lightening Arrestor for Antenna: The provision of Lightning Arrestor for Stacked Dipole 

Omni-Directional Antenna shall be made to protect the Radio Set from lightning or EMI. The 

protection system as described shall be earthed with the equipment earth. Lightening Arrestor 

for protection of 25 watt VHF base station sets, to be provided on coaxial cable. 

• Max. continuous DC Voltage : 180 V 

• Nominal load Current: 1 Amp 

• Nominal discharge current (8/20 µs) Core-Ground: 10kA 

• Impulse limiting voltage/Let through Voltage Core – Ground (1kV/ µs pulse): 1000 V 

• Operating temperature range: - 10ºC + 60ºC 

• Relative humidity: 5% to 95% 

• Degree of protection: IP 20 for providing near the equipment. And IP 54 for 

providing near antenna. 

• Connector: BNC/N/UHF connector or any other connector (As specified by the 

purchaser). 

• Bandwidth: 200 MHz Minimum 

• Insertion loss 0.2 dB maximum in 136-174 MHz 

• Power Handling: 50 Watts 

• Characteristic impedance: 50 ohms 

5.0 TECHNICAL REQUIREMENTS 

5.1 Station Equipment must be designed such that it does not use any Operating System Software 

for the operation. Also the Station Equipment design shall ensure faster speed of operation 

between it and LC Gate Equipment. Station Equipment shall preferably use 16-bit or higher 

databus microcontroller and shall consist of 

• MIL 810 C/D/E Compliant 25 Watt VHF Radio Set 

• Omni Directional Stacked Dipole Antenna having SWR less than 1.5 

• RG 217 Coaxial Cable 

• GPS Receiver along with Antenna 

• Power Supply 


• Battery 

• Solar Panel 

• Telephone Instruments 

• Electronic Circuit including, Data Logger, Voice Logger, Storage Etc. 

5.2 LC Gate Equipment must be designed such that it does not use any Operating System 

Software for the operation. Also the LC Gate Equipment design shall ensure faster speed of 

operation between it and Station Equipment. LC Gate Equipment shall preferably use 16-bit 

or higher databus microcontroller and shall consist of 

• MIL 810 C/D/E Compliant 25 Watt VHF Radio Set 

• Omni Directional Stacked Dipole Antenna having SWR less than 1.5 

• RG 217 Coaxial Cable 

• Power Supply 

• Battery 

• Solar Panel 

• Telephone Instruments 

• Electronic Circuit including, Data Logger, Storage etc. 

5.3 Station Equipment and LC Gate Equipment shall work with 12 V +/- 10% DC Power Supply, 

Current Consumption of Station Equipment/LC Gate Equipment shall be 10 Amp Maximum 

while working on Wireless Mode and shall be 1 Amp Maximum while working on Wired 

Model.. 

5.4 SMPS Power Supply shall be supplied alongwith Station Equipment, Power Supply shall 

consist of Battery Charger having 165-260 V, 50Hz AC Input Power Supply and having 

following outputs: 

• 27.2V+/- 0.5V DC, Output with current capacity of Minimum 2 Amp. 

• 12V +/-0.5V DC, Output with current capacity of Minimum 10 Amp 

Power Supply in addition to supplying the load shall also Charge 24Volt Battery. The Sealed 

Maintenance Free Battery is provided for backup of at least 24 hours. The capacity shall not 

be less than 120 AH. However, Railway may plan for a higher capacity of the battery to 

commensurate with the Load and Backup Period requirements. 

5.5 SMPS Power Supply shall be supplied along with each LC Gate Equipment. This SMPS 

Power Supply shall work with 165-260 V, 50Hz AC Input Power Supply and produce 12V 

+/- 10% DC Output Power supply with current capacity of Minimum 10 Amp. Power Supply 

in addition to supplying the load shall also Charge 12 Volt Sealed Maintenance Free Battery. 

The capacity of 12 Volts sealed Maintenance Free Battery shall be 120 AH. The Sealed 

Maintenance Free Battery is provided for backup of at least 96 Hours. 

5.6 Provision of Solar Panel along with Solar Charger shall also be made at Level Crossing Gate. 

Solar Panel Modules with Nominal Voltage of 12 Volt and Nominal Output Power of 

80 Watt as per IRS:S 84/92 with Latest Amendments shall be provided. Mounting Bracket & 


Bracing Plate for Solar Panel Modules, shall be as per requirement of site and as selected by 

the Purchaser amongst the options given in IRS:S 84/92 with Latest Amendments. However 

actual requirement of number of Solar Panels & its capacity may be specified by the 

Purchaser based upon the actual site requirement for 96 Hrs backup. 

5.7 Speaker Output Level shall be 3 Watt Maximum. Knob to adjust Speaker Output Level shall 

be provided at Station Equipment. 

5.8 25 Watt Radio: VHF Radio Set of 25 Watt for wireless communication shall be DGS&D 

approved. The radio shall be MIL Grade, 810C/D/E compliant. This 25 Watt Radio shall 

meet following specification: 

SN Parameters Characteristics 

A. GENERAL 

A1. Frequency Range 136 to 174 MHz 

A2. Channel Spacing 12.5 kHz 

A3. Emission 11K50F3 

A4. Frequency Spread 5 MHz or ore without degradation in Tx/Rx Specification 

A5. Frequency Stability 5 PPM or better 

A6. Type of Operation Simplex , Press to talk 

A7. Output Impedance 50Ω 

B. TRANSMITTER 

B1. RF Power Output 25 Watt +/- 0.5 dB. 

B2. Frequency Deviation +/-2.5 kHz Max. For 100% at 1 KHZ 

B3. Modulation Sensitivity 1 to 10 mV at 1 KHz at Mic. Input for +/- 1.5 KHz Standard 

B4. Modulation distortion Less than 5% at 1 KHz reference +/- 1.5 KHz Standard 

B5. Modulation fidelity Within +1, -3 dB of 6 dB / Octave Pre-emphasis characteristics 

from 350 Hz. to 2700 Hz. with 1 KHz as reference. 

B6. Spurious and Harmonics 

Suppression 

Better than 60 dB 

B7. Output Impedance 50 Ω 

C. RECEIVER 

C1. Sensitivity 0.3μv / -118 dbm at 12 dB SINAD 

C2. Selectivity Better than 60 dB 

C3. Image and Spurious Better than 65 dB 

C4. AF distortion Better than 5% 

C5. Audio output 1 W with less than 5% distortion at 1 kHz ref. measured at 

specified AF output. 

C6. Squelch Sensitivity 0.25µv or better at threshold. 

C7. AF Response Within +1 , -3 dB of 6 dB / Octave de-emphasis characteristics 

from 350 Hz. to 2700 Hz. with 1 KHz as reference. 

5.9 Specifications of Stacked Dipole Omni Directional Antenna 

SN Parameters Characteristics 


A ELECTRICAL SPECIFICATIONS 

A1 Frequency Range – MHz 136 - 174 

A2 Bandwidth – MHz 10 

A3 Impedance – Ohms 50 unbalanced 

A4 VSWR – less than 1.5 

A6 RF Power handling capacity – Watt 100 

A8 Termination N – female 

A9 Lightening Protection Direct Ground 

5.10 Specifications of Antenna Cable: 

Sl No Parameters Characteristics 

A1 Length As per site requirement 

A2 Size RG 217 Low Loss Cable 

A3 Characteristic Impedance 50 + / - 1 ohm 

A4 Average Power Rating 1.00 kW at 100 MHz 

A5 Attenuation 0.05 dB / Meter at 100 MHz 

5.11 Specification of Telephone Instrument: Telephone Instrument provided with Station 

Control Equipment and Gate Control Equipment shall be as per Appendix-IV. 

5.12 Terminals / Connectors: 

5.12.1 It is necessary to terminate the 2Wire input lines through Screw Terminals / Connectors to 

achieve lowest contact resistance & to avoid possibility of corrosion due to different climatic 

conditions, all metallic parts of the connectors / terminals should be non ferrous. The 

terminals & connectors should have locking arrangement so that input lines to the equipment 

should not get disconnected inadvertently. 

5.12.2 RJ11 & RJ 45 connectors shall be used to connect the 2 W telephone sets /lines / PC to 

eliminate any inadvertent disconnection of the input/output lines. 

5.12.3 All other connectors like antenna, power and solar panel shall be lockable so that it can not 

get disconnected inadvertently 

5.13 Provision of Earth Terminal shall be made in the Station Equipment and LC Gate Equipment 

to extend Erthing. The Earthing arrangement shall be provided by the Railways & is not the 

part of the equipment. 

6.0 ENVIRONMENTAL REQUIREMENTS: 

6.1 The equipments shall be capable of working in Non-Air Conditioned environment in the 

field. 

6.2 The equipments shall be suitable for installation on AC/DC Electrified and Non-Electrified 

sections. It shall be suitable in all areas including where locomotives having thyristor 


controlled Single Phase or 3-Phase Induction Motors haul Passenger or Freight Trains and 

where Chopper Controlled EMU Stocks are operated. 

7.0 TESTING & INSPECTION 

7.1 Type Test : Type Test shall comprise of the following Inspection/Test/Trial. 

a) Visual Inspection 

b) Applied High Voltage Test 

c) Endurance Test 

d) Performance Test 

e) Climatic Test 

f) Vibration Test 

g) Surge & Transient Test 

h) Final Performance Test 

One ‘Station Control Equipment’ and Two ‘LC Gate Control Equipments’ with all 

accessories shall be tested during Type Test. The ‘Station Control Equipment’ and ‘LC Gate 

Control Equipments’ shall successfully pass all the Inspection/Test/Trial for proving 

conformity with this specification. If any of the equipment fails in any of the 

Inspection/Test/Trial, RDSO may call for further equipment(s) and subject it to all the tests 

or to the test(s) in which failure occurred. No failure shall be permitted in the repeat test(s). 

7.2 Acceptance Tests: Acceptance Test shall comprise of the following Inspection/Test. 



c) Performance Test 

Acceptance Test shall be carried out on all Station Control Equipment. For LC Gate Control 

Equipment, the Double Sample Plan given as below shall be adopted during Acceptance Test: 

Lot consisting LC 

Gate Control 

Equipment 

1 st Sample 

size (N1) 

2 nd Sample 

size (N2) 

Combined 

Sample size 

(N1 + N2) 

Acceptance 

Number (C1) 

Rejection 

Number 

(C2) 

C1 C2 C3 C4 C5 C6 

Under 25 3 6 9 0 2 

25 to 50 7 14 21 0 3 

51 to 100 10 20 30 0 3 

101 to 200 13 26 39 0 5 

201 to 300 20 40 60 1 5 

301 to 500 25 50 75 1 6 


The number of LC Gate Control Equipment (N1) as given in Column C2 shall first be 

selected and subjected to the Acceptance Test. If in the first sample, the number if defective 

LC Gate Control Equipment, that is those failing in one or more acceptance test is less than 

or equal to the corresponding number (C1) given in C5, that lot shall be considered as 

conforming to the requirement of the acceptance test. If the number of defective level 

crossing gate control equipment in the first sample is greater than or equal to the rejection 

number in C6, the lot shall be considered as not conforming to the requirements of the 

acceptance test. If number of defective level crossing gate control equipment in the first 

sample lies between C1 and C2 a second sample of size N2 as given in Col.3 shall be 

selected and subjected to the acceptance test. If in the combined sample, the number of 

defective level crossing gate control equipment is less than C2, the lot shall be considered as 

conforming to the requirement of acceptance test. 

7.3 Routine Tests : Routine Test shall be conducted by manufacturer on every equipment and 

test results will be submitted during the inspection. Routine Test shall comprise of the 

following: 



d) Performance Test 

7.4 Visual Inspection: 

7.4.1 The equipment shall be visually inspected to ensure that it is free from any cracks or any 

other imperfection including marking and painting etc. 

7.4.2 The equipment shall be checked to satisfy general requirement of Marking & Packing. 

7.4.3 The visual inspection shall be carried out to ensure that the equipment is of sound 

construction and, meets its specified requirement of Specification. 

7.5 Applied High Voltage Test: The equipment shall with stand without any damage a test 

voltage of 1KV, applied for a period of one minute, between the body and all the current 

carrying terminals looped together. 

7.6 Endurance Test: The equipment shall be capable of withstanding Burn-In Test for 72 hours 

during Type Test (8 Hours during Acceptance Test) at an ambient temperature of 50(+ 2) ºC 

when the equipment is working. This test may be performed in a temperature-controlled 

room with free airflow. The ambient temperature shall be measured at a distance of 1 foot 

from the equipment under test. The necessary set up for the purpose shall be provided by the 

manufacturer. 

The equipment shall be burn – in for a period of one day at 50 o C prior to the actual measurement of 

the parameters. During the burn-in, the equipment shall be kept in ‘ON’ condition. 

7.7 Performance Test: The Performance test shall be conducted as per Performance Test 

Procedure proposed by manufacturer duly reviewed and approved by RDSO/Lucknow. The 

Performance Test shall include comprehensive series of measurements of the characteristics 


of the equipment to check its performance in accordance with the Functional, System & 

Technical requirements of the specification. The Performance Test shall also include Power 

Supply Variation Test and Power Supply Interruption Test. 

The Performance Test shall include comprehensive series of measurements of the 

characteristics of the equipment to check that its performance is in accordance with the 

functional requirements of the particular equipment concerned, including any special 

requirements of its individual specification. The Performance Test shall also include Power 

Supply Variation Test and Power Supply Interruption Test. 

7.8 Climatic Test: 

7.8.1 Under Climatic Test, Station Control Equipment and Gate Control Equipments shall undergo 

following Tests: 

SN TEST REFERENCE 

1. Change of Temp Test IS 9000 Part XIV Sect. II 

Low temp –10 o C ± 3 o C 

High temp +55 o C ± 2 o C 

Rate of change in 1 o C+ 0.2 o C / min 

Duration 3 Hrs at each temp. –10 o C & +55 o C 

Cycle 1 

Condition Fully functional during Test 

2. Dry Heat Test IEC-571; IS:9000 Part-III Sect 

3 

Temp +55 o C + 0.2 o C 

Duration 12 hrs 

Condition Fully functional during Test 

3. Cold Test IS 9000 Part II Sect. III 

Temp –10 o C ± 3 o C 

Duration 2 hours 

Condition Fully functional during Test. 

4. Damp Heat Test (Cyclic) IS 9000 Part V Sect. 2, 12+12 

Hours Cycle, Variant 1 

Upper temp 40 o C ± 2 o C 

Humidity 95% (+1%, -5%) 

Cycles 6 

Condition Fully functional during one hour 

5. Damp Heat Test (Steady State Storage) IS 9000 Part IV 

Temp 40 o ± 2 o C 

Humidity 93% (+2% , -3%) 

Severity 4 days 

Condition Fully functional during Test. 

6. Salt Mist Test IS 9000 Part XI Procedure I 

Duration 48 Hours 


7.8.2 During some of the above Climatic Tests, which requires equipments to be kept in Operating 

Condition, functioning of all the major module LCD Display, LED Indications, VHF Set, 

Voice Logger, Telephone Instrument shall be observed. 

7.9 Vibration Test 

7.91 Vibration Test shall be conducted as per IS:9001 Pt. XIII in Operating Condition. The 

Vibration Test shall be conducted to withstand the following test conditions. 

(i) Frequency 5 to 150 Hz 

(ii) Acceleration 2 g Constant Acceleration 

(iii) Direction of Vibration X,Y,Z 

(iv) Sweep Cycle per Axis 20 

7.9.2 The frequency is to be varied continuously from the lowest to the highest value over the 

specified range, at such rate that resonances can be easily detected. The rate of change of 

frequency will not normally exceed one octave in one minute. Resonances may be observed 

by stroboscope or other means. All frequencies at which assemblies are detected to resonate 

shall be noted. At the end of the test the equipment is to be examined for mechanical 

damages. 

7.10 Surge & Transient Test: Station Equipment, LC Gate Equipment shall undergo Basic 

Immunity Requirement Tests of Surge & Transient as follows: 

7.10.1 2-Wire Physical Communication Line Port of station Equipment & LC Gate Equipment shall 

be tested for Basic Immunity Requirements of Surges as per Test Method IEC 61000-4-5. 

During this test, 5 (five) Pulses of 10/700µS with Amplitude of 1.0 KV (CM) and 0.5KV 

(DM) each in Positive as well as Negative Polarity shall be applied. During and after the 

Test, Station Equipment & LC Gate Equipment shall continue to operate as intended without 

any malfunctioning and degradation in performance. 

7.10.2 2-Wire Physical Communication Line Port of Station Equipment & LC Gate Equipment shall 

also be tested for Basic Immunity Requirements of Fast Transient as per Test Method IEC 

61000-4-4. During this test, Pulses with Amplitude of 0.5KV each in Positive as well as 

Negative Polarity shall be applied. During and after the test, Station Equipment & LC Gate 

Equipment shall continue to operate as intended without any malfunctioning and degradation 

in performance. 

7.10.3 230V AC Power Supply Port of SMPS Power Supply of Station Equipment as well as LC 

Gate Equipment shall be tested for Basic Immunity Requirements of Surges as per Test 

Method IEC 61000-4-5. During this Test, 5(Five) Pulses of 1.2/50µS with Amplitude of 1.0 

KV (CM) and 0.5 KV (DM) each in Positive as well as Negative Polarity shall be applied. 

During and after the Test, Power Supply shall continue to operate as intended without any 

malfunctioning and degradation in performance. 


7.11 Final Performance Test : After competition of all above said tests as explained above , Final 

Performance Test shall be conducted. 

8.0 TYPE APPROVAL : The ‘Level Crossing Gate Control & Monitoring System’ should have 

Type Approval from RDSO. The type approval process shall include Type Test & Field Trial 

to check the compliance of the specified parameters. 

8.1 The Type Test shall be conducted preferably at RDSO/Lucknow. However, in case of any 

difficulty of infrastructure or any other facility at RDSO/Lucknow, the Type Test may be 

conducted either at Manufacturer’s Premises or in any other mutually agreed Test 

Laboratory. All instrumentation and set up required for the Type Test shall be provided by 

the manufacturer. 

8.2 Performance Tests will not be carried out on 25 Watt Radio, as this item will be 

DGS&D/DCPW approved. The certificate of the same shall be submitted at the time of Type 

Approval. 

8.3 Field Trial : After successful completion of all Tests mentioned in Clause,7.4 to 7.11, field trial for 

3 Months shall be conducted by installing complete equipment in a selected station and gates on a 

selected selection to judge the performance of the system. 

8.4 After successful completion of Type Test and Field Trial, Type Approval may be processed. 

9.0 MARKING & PACKING: The following information shall be clearly 

Embossed/Engraved/Screen Printed at a conspicuous places. 

a) Item Name 

b) RDSO Specification No. 

c) Name or Monogram of the Manufacturer 

d) Year of Manufacture 

e) Serial Number 

9.1 Equipment shall be suitably packed so as to avoid any damage or loss during storage and 

transit. 

10.0 TECHNICAL LITERATURE: Technical literature consisting of Principles of Working, 

Circuit / Block Diagram Maintenance and Trouble Shooting Procedures, Assembly Drawing, 

Spares Parts Catalogue, Printed Card Layout Diagram, shall be supplied along with 

equipment unless otherwise not desired by the user Railway. 

11.0 INFORMATION TO BE FURNISHED BY PURCHASER 

a) Capacity of Battery as defined in Clause 5.4. 

b) Length of Antenna Cable as per Clause 5.10 (A1). 

c) Antenna Specification: If purchaser wishes to procure any other type of antenna depending 

upon the site requirement instead of Omni Directional Antenna as defined in Clause 5.9. 

d) Capacity of Solar Panel as per Clause 5.6. 

*****END***** 


Panel Diagram for LC Gate Equipment. 

Panel Diagram for Station Equipment 

APPENDIX-I 


APPENDIX-II 

WORKING OF DIFFERENT CATOGORY OF LC GATES in MANUAL Mode 

(A) Engineering LC Gate, Interlocked, Normally Open to Road Traffic 

Intimation to Gateman for Approaching Train 

(1) To advise Gateman about approaching Train, Station Master shall feed ‘Train No.’, ‘Expected 

Time of Passage’ & ‘Outgoing Private Number’. Subsequently SM shall press ‘Common 

Button’ and ‘Advise Button’ of concerned LC Gate for 3 Seconds. This will transmit ‘Direction of 

Train’, ‘Train No.’, ‘Expected Time of Passage’ and ‘Outgoing Private Number’ to LC Gate. ‘Advise 

Display’ for concerned LC Gate on Station Equipment will also start flashing ‘- -’. This will also 

clear the ‘Outgoing Private Number Display’ of Station Equipment. 

For a Group Message to more than one, Engineering, Interlocked, Normally Open to Road Traffic LC 

Gate, Station Master shall press ‘Advise Buttons’ of all the concerned LC Gate simultaneously 

along with ‘Common Button’ for 3 Seconds. 

(2) On receipt of above messages at LC Gate, ‘Train No.’ & ‘Expected Time of Passage’ will be shown 

in Main Display and ‘Incoming Private Number’ will be shown flashing on ‘Advise Display’. Audio 

Message will also start playing at LC Gate Equipment. On Pressing ‘MUTE Button’ by Gateman 

for 1 Seconds, audio will stop playing. The Gateman shall feed ‘Outgoing Private Number’. 

Subsequently Gateman shall press ‘Advise Button’ along with ‘Common Button’ for 3 seconds. 

This will transmit the Private Number to Station and ‘Advice Display’ will also become steady. This 

will also clear the ‘Outgoing Private Number Display’ of LC Gate Equipment. 

(3) On receipt of this Private Number from LC Gate, it will be shown on ‘Advise Display’ of concerned 

LC Gate on Station Equipment. 

(4) On Pressing ‘Clear Button’ along with ‘Common Button’ by Station Master for 1 Seconds, 

Main Display and ‘Advise Display’ will be cleared. 

(5) On Pressing ‘Clear Button’ along with ‘Common Button’ by Gateman for 1 Seconds, Main 

Display and ‘Advise Display’ will be cleared. 

----xxxx---- 


(B) Engineering LC Gate, Non-Interlocked, Normally Open to Road Traffic 

Closing the Gate for Road Traffic 




Train’, ‘Train No.’, ‘Expected Time of Passage’ and ‘Private Number’ to LC Gate. ‘Advise Display’ 

for concerned LC Gate on SM Equipment will also start flashing ‘- -’. This will also clear the 

‘Outgoing Private Number Display’ of Station Equipment. 

For a Group Message to more than one, Engineering, Non-Interlocked, Normally Open to Road 

Traffic LC Gate, Station Master shall press ‘Advise Buttons’ of all the concerned LC Gate 

simultaneously along with ‘Common Button’ for 3 Seconds. 




for 1 Seconds, audio will stop playing. The Gateman shall feed ‘Outgoing Private Number’. 

Subsequently Gateman shall press ‘Advise Button’ alongwith ‘Common Button’ for 3 seconds. 

This will transmit the Private Number to Station and ‘Advise Display’ will also become steady. This 

will also clear the ‘Outgoing Private Number Display’ of LC Gate Equipment. 



(4) After Closing the Gate, Gateman shall feed ‘Outgoing Private Number’. Subsequently Gateman 

shall press ‘Common Button’ and ‘Close Button’ for 3 Seconds. This will transmit ‘Private 

Number’ to Station Master and ‘Close Display’ on LC Gate Equipment will also start flashing ‘- -’. 

This will also clear the ‘Outgoing Private Number Display’ of LC Gate Equipment. 

(5) On receipt of this message at Station Equipment, ‘Incoming Private Number’ will be shown flashing 

on ‘Close Display’ of concerned LC Gate and Audio Message will also start playing. On pressing 

MUTE Button by Station Master for 1 Seconds, audio will stop playing. Station Master shall 

feed Private Number. Subsequently Station Master shall press ‘Close Button’ of concerned LC 

Gate alongwith ‘Common Button’ for 3 Seconds. This will transmit ‘Private Number’ to concerned 

LC Gate and ‘Close Display’ for concerned LC Gate will become steady. This will also clear the 


(6) On receipt of this Private Number from Station, it will be shown on ‘Close Display’ of LC Gate 

Equipment. 

Opening the Gate for Road Traffic 

On some railways, if for opening of LC Gate if permission of Station Master under exchange of 

Private Number is required, then following procedure(Steps 7, 8 & 9) will be followed. 


(7) For opening the LC Gate, Gateman shall feed ‘Private Number’. Subsequently, Gateman shall 

press ‘Common Button’ and ‘Open Button’ for 3 Seconds. This will transmit ‘Private Number’ to 

Station and ‘Open Display’ will start flashing ‘- -’ at LC Gate Equipment. This will also clear 

‘Outgoing Private Number Display’ from LC Gate Equipment. 

(8) On receipt of this ‘Private Number’ it will be shown flashing on ‘Open Display’ of concerned LC 

Gate on Station Equipment, and Audio Message will also start playing at Station Equipment. On 

pressing MUTE Button for 1 Seconds, audio will stop playing. If SM wish to permit Gateman to 

Open LC Gate to Road Traffic, he shall feed Private Number. Subsequently Station Master shall 

press ‘Open Button’ of concerned LC Gate alongwith ‘Common Button’ for 3 Seconds. This 

will transmit ‘Private Number’ to LC Gate. ‘Open Display’ for concerned LC Gate will also become 

Steady. This will also clear the ‘Outgoing Private Number Display’ of LC Gate Equipment. 

(9) On receipt of above message from Station, Private Number will be shown in ‘Open Display’. This 

will authorize the Gateman to open the LC Gate for Road Traffic. 

(10) On Pressing ‘Clear Button’ alongwith ‘Common Button’ by Station Master for 1 Seconds, Main 

Display, ‘Advise Display’, ‘Close Display’ & ‘Open Display’ will be cleared. 

(11) On Pressing ‘Clear Button’ alongwith ‘Common Button’ by Gateman for 1 Seconds, Main 

Display ‘Advise Display’, ‘Close Display’ & ‘Open Display’ will be cleared. 

----xxxx---- 


(C) Engineering LC Gate, Non-Interlocked, Normally Closed to Road Traffic 


(1) For opening the LC Gate, Gateman shall feed ‘Private Number’. Subsequently, Gateman shall 

press ‘Common Button’ and ‘Open Button’ for 3 Seconds. This will transmit Private Number to 

Station and ‘Open Display’ will start flashing ‘- -’ at LC Gate Equipment. This will also clear 

Outgoing Private Number from ‘LC Gate Equipment’. 


Gate on Station Equipment and Audio Message will also start playing at Station Equipment. On 




will transmit Private Number to LC Gate. ‘Open Display’ for concerned LC Gate will also become 

Steady. This will also clear the ‘Outgoing Private Number Display’ of Station Equipment. 

(3) On receipt of above message from Station, ‘Private Number’ will be shown in ‘Open Display’. This 




shall press ‘Common Button’ and ‘Close Button’ for 3 Seconds. This will transmit ‘Private 

Number’ to Station Master and ‘Close Display’ on LC Gate Equipment will also start flashing ‘- -’. 

This will also clear the ‘Outgoing Private Number Display’ of Station Equipment. 

(5) On receipt of this message at Station, Incoming Private Number will be shown flashing on ‘Close 

Display of concerned LC Gate and Audio Message will also start playing. On pressing MUTE 

Button by Station Master for 1 Seconds, audio will stop playing. Station Master shall feed 

Private Number. Subsequently Station Master shall press ‘Close Button’ of concerned LC Gate 

alongwith Common Button for 3 Seconds. This will transmit Private Number to concerned LC 

Gate and ‘Close Display’ for concerned LC Gate will become steady. This will also clear the 


(6) On receipt of this ‘Private Number’ will be shown on ‘Close Display’ of LC Gate Equipment. 

(7) On Pressing ‘Clear Button’ alongwith ‘Common Button’ by Station Master for 1 Seconds, 

‘Close Display’ & ‘Open Display’ will be cleared. 

(8) On Pressing ‘Clear Button’ alongwith ‘Common Button’ by Gateman for 1 Seconds, ‘Close 

Display’ & ‘Open Display’ will be cleared. 

----xxxx---- 


(D) Traffic LC Gate, Interlocked, Normally Open to Road Traffic 





Train’, ‘Train No.’, ‘Expected Time of Passage’ and ‘Outgoing Private Number’ to LC Gate. ‘Advise 

Display’ for concerned LC Gate on Station Equipment will also start flashing ‘- -’. This will also 

clear the ‘Outgoing Private Number Display’ of Station Equipment. 

For a Group Message to more than one, Traffic, Interlocked, Normally Open to Road Traffic LC 


alongwith ‘Common Button’ for 3 Seconds. 




for 1 Seconds, audio will stop playing. The Gateman shall feed Private Number which will be 

shown on ‘Outgoing Private Number Display’ of Gate. Subsequently Gateman shall press 

‘Advise Button’ alongwith ‘Common Button’ for 3 seconds. This will transmit the Private Number 

to Station and ‘Advise Display’ will also become steady. This will also clear the ‘Outgoing Private 

Number Display’ of Station Equipment. 



(4) On Pressing ‘Clear Button’ alongwith Common Button by Station Master for 1 Seconds, Main 




----xxxx---- 


(E) Traffic LC Gate, Non-Interlocked, Normally Closed to Road Traffic 


(1) For opening the LC Gate, Gateman shall feed ‘Private Number’. Subsequently, Gateman shall press 

‘Common Button’ and ‘Open Button’ for 3 Seconds. This will transmit Private Number to Station 

and ‘Open Display ’ will start flashing ‘- -’ at LC Gate Equipment. This will also clear Outgoing 

Private Number from ‘LC Gate Equipment’. 






will transmit Private Number to LC Gate. ‘Open Display’ for concerned LC Gate will also become 

Steady. This will also clear Outgoing Private Number from ‘Station Equipment’. 





shall press ‘Common Button’ and ‘Close Button’ for 3 Seconds. This will transmit Private 

Number to Station Master and clear ‘Outgoing Private Number Display’ from ‘LC Gate Equipment’. 

‘Close Display’ on LC Gate Equipment will also start flashing ‘- -’. This will also clear Outgoing 

Private Number from ‘LC Gate Equipment’. 

(5) On receipt of this message at Station, Incoming Private Number will be shown flashing on ‘Close 

Display of concerned LC Gate and Audio Message will also start playing. On pressing MUTE 

Button by Station Master for 1 Seconds, audio will stop playing. Station Master shall feed 

Private Number. Subsequently Station Master shall press ‘Close Button’ of concerned LC Gate 

alongwith Common Button for 3 Seconds. This will transmit ‘Private Number’ to concerned LC 

Gate and ‘Close Display’ for concerned LC Gate will become steady. This will also clear Outgoing 

Private Number from ‘Station Equipment’. 

(6) On receipt of this Private Number from Station it will be shown in ‘Close Display’ of LC Gate 

Equipment. 





----xxxx---- 


APPENDIX-III 

WORKING OF DIFFERENT CATOGORY OF LC GATES in AUTO Mode 

(A) Engineering LC Gate, Interlocked, Normally Open to Road Traffic 


(1) To advise Gateman about approaching Train, Station Master shall feed ‘Train No.’ & ‘Expected 

Time of Passage’. Subsequently SM shall press ‘Common Button’ and ‘Advise Button’ of 

concerned LC Gate for 3 Seconds. This will automatically generate Private Number and transmit it 

alongwith ‘Direction of Train’, ‘Train No.’ & ‘Expected Time of Passage’ to LC Gate. This will also 

show the ‘Outgoing Private Number’ on ‘Outgoing Private Number Display’ of Station Equipment. 

‘Advise Display’ for concerned LC Gate on Station Equipment will also start flashing ‘- -’. 

For a Group Message to more than one, Engineering, Interlocked, Normally Open to Road Traffic LC 






for 1 Seconds, audio will stop playing. Gateman shall press ‘Advise Button’ alongwith ‘Common 

Button’ for 3 seconds. This will automatically generate Private Number and transmit it to Station. 

This will also show the ‘Outgoing Private Number’ on ‘Outgoing Private Number Display’ of LC 

Gate Equipment’. ‘Advise Display’ will also become steady. 







----xxxx---- 


(B) Engineering LC Gate, Non-Interlocked, Normally Open to Road Traffic 


(1) To advise Gateman about approaching Train, Station Master shall feed ‘Train No.’ & ‘Expected 

Time of Passage’. Subsequently SM shall press ‘Common Button’ and ‘Advise Button’ of 

concerned LC Gate for 3 Seconds. This will automatically generate Private Number and transmit it 

alongwith ‘Direction of Train’, ‘Train No.’ & ‘Expected Time of Passage’ to LC Gate. This will also 


‘Advise Display’ for concerned LC Gate on Station Equipment will also start flashing ‘- -’. 

For a Group Message to more than one, Engineering, Non-Interlocked, Normally Open to Road 

Traffic LC Gate, Station Master shall press ‘Advise Buttons’ of all the concerned LC Gate 

simultaneously alongwith ‘Common Button’ for 3 Seconds. 










(4) After Closing the Gate, Gateman shall press ‘Common Button’ and ‘Close Button’ for 3 Seconds. 

This will automatically generate Private Number and transmit it to Station. This will also show the 

‘Outgoing Private Number’ on ‘Outgoing Private Number Display’ of LC Gate Equipment’. ‘Close 

Display’ on LC Gate Equipment will also start flashing ‘- -’. 




press ‘Close Button’ of concerned LC Gate alongwith ‘Common Button’ for 3 Seconds. This 

will automatically generate Private Number and transmit it to concerned LC Gate. ‘Close Display’ for 

concerned LC Gate will also become steady. 


Equipment. 



On some railways, if for opening of LC Gate if permission of Station Master under exchange of 

Private Number is required, then following procedure(Steps 7, 8 & 9) will be followed. 

(7) For opening the LC Gate, Gateman shall press ‘Common Button’ and ‘Open Button’ for 3 

Seconds. This will automatically generate Private Number and transmit it to Station. ‘Open Display’ 

will start flashing ‘- -’ at LC Gate Equipment. This will also show the ‘Outgoing Private Number’ on 

‘Outgoing Private Number Display’ of LC Gate Equipment. 


Gate on Station Equipment, and Audio Message will also start playing at Station Equipment.. On 

pressing MUTE Button for 1 Second audio will stop playing. If SM wish to permit Gateman to Open 

LC Gate to Road Traffic, he shall press ‘Open Button’ of concerned LC Gate alongwith 

‘Common Button’ for 3 Seconds. This will automatically generate Private Number and transmit it to 

SM to LC Gate. ‘Open Display’ for concerned LC Gate will also become Steady. This will also show 

the ‘Outgoing Private Number’ on ‘Outgoing Private Number Display’ of Station Equipment. 




Display, ‘Advise Display’, ‘Close Display’ & ‘Open Display’ will be cleared. 


Display ‘Advise Display’, ‘Close Display’ & ‘Open Display’ will be cleared. 

----xxxx---- 


(C) Engineering LC Gate, Non-Interlocked, Normally Closed to Road Traffic 









Open LC Gate to Road Traffic, he shall press ‘Open Button’ of concerned LC Gate alongwith 


Station to LC Gate. ‘Open Display’ for concerned LC Gate will also become Steady. This will also 






This will automatically generate Private Number and transmit it to Station. ‘Close Display’ on LC 

Gate Equipment will also start flashing ‘- -’. This will also show the ‘Outgoing Private Number’ on 

‘Outgoing Private Number Display’ of LC Gate Equipment’. 






concerned LC Gate will also become steady. This will also show the ‘Outgoing Private Number’ on 

‘Outgoing Private Number Display’ of Station Equipment’. 


Equipment. 





----xxxx---- 


(D) Traffic LC Gate, Interlocked, Normally Open to Road Traffic 




Button’ and ‘Advise Button’ of concerned LC Gate for 3 Seconds. This will automatically 

generate Private Number and transmit it alongwith ‘Direction of Train’, ‘Train No.’ & ‘Expected 

Time of Passage’ to LC Gate. This will also show the ‘Outgoing Private Number’ on ‘Outgoing 

Private Number Display’ of Station Equipment. ‘Advise Display’ for concerned LC Gate on Station 

Equipment will also start flashing ‘- -’. 

For a Group Message to more than one, Traffic, Interlocked, Normally Open to Road Traffic LC 

Gates, Station Master shall press ‘Advise Buttons’ of all the concerned LC Gates simultaneously 















----xxxx---- 


(E) Traffic LC Gate, Non-Interlocked, Normally Closed to Road Traffic 







Gate on Station Equipment and Audio Message will also start playing at Station Equipment. On 

pressing ‘MUTE Button’ for 1 Second, audio will stop playing. If SM wish to permit Gateman to 

Open LC Gate to Road Traffic, he shall press ‘Open Button’ of concerned LC Gate alongwith 


Station to LC Gate. ‘Open Display’ for concerned LC Gate will also become Steady. This will also 






This will automatically generate Private Number and transmit it to Station. ‘Close Display’ on LC 

Gate Equipment will also start flashing ‘- -’. This will also show the ‘Outgoing Private Number’ on 

‘Outgoing Private Number Display’ of LC Gate Equipment’. 



‘MUTE Button’ by Station Master for 1 Seconds, audio will stop playing. Station Master shall 



concerned LC Gate will become steady. This will also show the ‘Outgoing Private Number’ on 


(6) On receipt of this Private Number from Station Master, it will be shown in ‘Close Display’ of LC 

Gate Equipment. 





----xxxx---- 


1.0 GENERAL REQUIREMENTS OF TELEPHONE INSTRUMENTS: 

APPENDIX-IV 

1.1 The Telephone Instrument provided with Station Control Equipment will be called Station 

Telephone and Telephone Instrument provided with Gate Control Equipment will be called 

Gate Telephone. 

1.2 Station Telephone and Gate Telephone shall work in Master-Slave Mode, with Station 

Telephone as Master and Gate Telephone as Slave. 

1.3 Station Telephone shall have the facility to call individually any of the LC Gates by pressing 

the corresponding Push Button switch designated for a particular LC Gate Telephone. LC 

Gates which are not called by Station Master should neither be able to listen nor talk. 

Station Telephone shall also have the facility to call collectively all the gates by ‘ALL 

CALL’ Push Button. On pressing this button, a general ring will go to all the Gate 

Telephones simultaneously. For imparting certain common instruction simultaneously or for 

conference purposes this ALL CALL general ring will be used. 

In addition to these Push Buttons, Station Telephone shall have another Push Button 

‘DISCONNECT’ for disconnecting the Gate Telephone(s). When this switch is pressed, all 

the Gate Telephone(s) connected in the circuit will be deactivated and speech will not be 

through to and from those Gate Telephone(s). 

1.4 Gate Telephone will have the facility to send an indication to the Station Telephone that it 

wants to talk to the Station Master. The Gate Telephone will have only one Push Button by 

pressing which it will draw the attention of the Station Master. 

1.5 DTMF Codes for above activities are given below. These Two-Digit DTMF Codes shall be 

generated by pressing Single Push Button or by an action of Handset. Duration of Code will 

be as per 200+50 ms(Presence Time), 100+50 ms(Absence Time). 

(a) DTMF Codes generated by Master Telephone when it presses Gate Telephone Buttons. 

Master presses Gate Telephone Up 1 21 

Master presses Gate Telephone Dn 1 22 







(b) DTMF Codes generated by Gate Telephones when they call Master Telephone. 

Gate Telephone Up 1 Calls Master Tel 31 


Gate Telephone Dn 1 Calls Master Tel 32 







(c) DTMF Codes generated by Gate Telephones when Gate Telephone Handset is put down 

Gate Telephone Up 1 puts down its Handset 51 

Gate Telephone Dn 1 puts down its Handset 52 







(d) When Master Telephone Press ALL CALL Switch, DTMF Code Generated is 88. 

(e) When Master Telephone Press DISCONNECT Switch, DTMF Code Generated is 99. 

1.6 The Station Telephone and Gate Telephone shall permit working of Voice Communication 

and Signaling on 2-Wire Omnibus Circuit. 

1.7 It shall be possible to send the signaling code even when two or more parties are in 

conversation. 

1.9 AUDIO-VISUAL INDICATIONS: 

1.9.1 Master Telephone : 

Power ON LED Power ON LED is of Green colour and will glow when handset of the telephone 

is lifted. This LED is to be fixed on the right hand side of the telephone. 

Calling Indications: Eight Red colored LEDs will be provided near the eight Calling push switches. 

Gate telephone numbers shall be suitably printed to designate the push switch 

and the LED. When a Gateman calls Station Master by pressing the CALL ASM 

switch, the corresponding LED in Master Telephone will blink, as well as a piezo 

buzzer will sound. This blinking LED will glow steadily when master presses the 

corresponding push switch. 

This LED will also glow steadily when Master calls some gate by pressing the 

corresponding switch. 

These LEDs will go OFF when “Disconnect” switch is pressed. 


1.9.2 Gate Telephone : 

A piezo buzzer will also sound when it is being called by the gate telephone and 

it should generate an interrupted / musical sound. 

Power ON LED This is of Green color and will glow when handset of the telephone is lifted. This 

is to be fixed on the right hand side of the telephone. 

Calling Indications: A Red colour LED will be in the left side of the telephone. This LED will glow 

when Master calls the Gate. This LED will go OFF when the handset of the 

telephone is lifted. The LED will glow and Piezo Buzzer will also sound both in 

ON hook and OFF hook condition. 

Ring back Tone : Ring Back Tone (RBT) will be sent back to the Master Telephone when a Gate 

Telephone Rings. The level of RBT at the Gate Telephone output point will be 

more than –12 dBm. 

2.0 TECHNICAL REQUIREMENTS OF TELEPHONE INSTRUMENTS: 

2.1 The telephone shall be protected from Surge and Transients by using “GDT”, “PTC” 

“MOVR” and Inductor based surge protection system. 

2.2 The receiver of the telephone instrument shall be protected from acoustic shocks by 

providing two rectifiers in parallel and with opposite polarity across the receiver. 

2.3 Workmanship should conform to good engineering practice so as to ensure that the 

instrument is free form defects, rust, cracks and other defects that could impair the operation 

or serviceability while in use or under storage. The treatment and finishes shall be such that 

under operating conditions, no deterioration occurs to any of the parts. 

2.4 All the components, switches, connectors etc., shall be of High Quality/Industrial Grade/ 

CACT Approved Type and should be procured from renowned manufacturer. The 

components should be freely available in the market. All the numbers of components should 

be clearly indicated. The LED indicators wherever used shall be of superior quality wide 

angle with metallic holders. The component type numbers shall not be defaced. 

2.5 The layout of components and wiring shall be such that all parts are easily accessible for 

inspection, repair and replacement. 

2.6 The Master and Gate Telephones should work properly from individual DC Power source of 

12 V DC + 20%. 

2.7 Unless permitted and activated by the Master, “Gate to Master” or “Gate to Gate” or “Master 

to Gate” conversation is not possible. Only when Master presses a particular key designated 

for a particular Gate, that Gate Telephone will be activated for conversation. 


2.8 Only when Master presses two or more Gate switches, those Gates are activated and will be 

able to converse to the Master as well as between them. The activated Gate Telephone will 

remain activated for conversation even if the handset of the master telephone is placed on the 

hook so that conversation between the Gate Telephones can continue. The Gate Telephone 

will be disconnected and Indicating LED on Master telephone meant for that particular Gate 

Telephone will go OFF, when the handset of that particular Gate Telephone is placed on the 

hook. 

2.9 In Telephone Mode, all the 9 Telephones connected as per Figure-1 should work from this 

Single Power Source and no separate Power supply will be provided at the Gates. 

2.10 When in Telephone Mode, and available voltage at a Gate Telephone is less than 9.6 Volt at 

the time of All Call Ringing(due to Longer Distance or due to High Conductor Loop 

Resistance or due to Location of other Telephones), this Gate Telephones should work 

satisfactorily with individual Power Supply arrangement of 12 V DC+20%. 

2.11 Current consumption by the telephones at 12 V DC shall not be more than the limits 

mentioned below: 

For Master Telephone : 

• 15 mA in idle condition. 

• 200 mA during ring with all 8 LEDs glowing. 

• 40 mA during speech condition 

For Slave Telephone: 

• 15 mA in idle condition. 

• 35 mA during ring 

• 25 mA during speech condition. 

3.0 CONSTRUCTION AND MATERIALS 

3.1 The body of the telephone instrument shall be made of ABS (Acrylonitrile Butadiene 

Styrene) Plastic material. 

3.2 The Handset when resting on the cradle of completely assembled telephone shall push the 

plunger(s) down to the limits of travel. The plunger(s) shall be free and shall not stick. The 

plunger(s) lifting spring shall be tensioned to give a positive action. Handset of the 

Telephone when ON Hook or OFF Hook shall operate the Cradle Switch Mechanism, which 

shall be checked electrically. 

3.3 Piezo Electric Buzzer operating at suitable voltage generated internally by the circuitry shall 

be provided. Buzzer of proper size shall be fixed inside the telephone body firmly. Suitable 

holes or grills should be available in the body of the telephone instrument for audibility of 

sound from piezo electric buzzer. 


3.4 Standard DTMF Tone Generator shall be provided to produce DTMF tones. It shall be 

possible to assign any code to a Gate telephone (Slave telephones) using ‘DIP’ switches. 

3.5 Standard DTMF decoder shall be provided. On receipt of the valid code/tone, it shall be 

decoded and Piezo electric buzzer & LED shall be activated when the handset of the 

telephone is ON or OFF the cradle. 

3.6 The wiring shall normally be by means of coloured PVC insulated multi strand flexible wire 

of good quality and of suitable size. 

3.7 Glass Epoxy PCB of minimum 1.6mm thickness shall only be used. The PCB shall be coated 

with epoxy based anti fungal varnish to provide protection against dust, humidity, fungal 

infection and mechanical abuses. 

3.8 The wiring to the components shall be provided with sufficient slack to permit the 

components to be swung clear of the assembly without any disconnection. 

3.9 Transformer: Ferrite Material shall be used for core so as to obtain required Electrical 

Properties. Manufacturer shall provide documentary evidence for use of Ferrite Material. The 

complete winding shall be protected by proper insulation to avoid ingress of moisture. 

4.0 ELECTRICAL CHARACTERISTICS: 

4.1 Electrical Circuit of the Telephone Instrument shall provide good matching between Line and 

the Instrument with minimum Sidetone. 

4.2 The output of the Code Generator shall be adjustable from 0 dBm to –7dBm when measured 

across 600 Ohm resistance connected across Line Terminals L1 and L2. 

4.3 It shall be possible to work the Signaling System with a minimum input level of -25 dBm at 

the Line Terminals with the Line S/N ratio of 15. The Telephone shall work satisfactorily for 

input level of -25dBm to –2dBm. 

4.4 One Station Telephone and Eight Gate Telephones are connected together through an 

artificial line with distributed loop resistance as shown in Figure below and it should be 

possible to call and get ring on all the Gate Telephones. Speech quality should be good. 


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government of india ministry of railways - rdso - Indian Railway

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